Short in "Slow Down" Circut 89 TR | FerrariChat
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Short in "Slow Down" Circut 89 TR

Discussion in 'Technical Q&A' started by the head, Aug 21, 2008.

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  1. the head

    the head Karting

    Mar 6, 2008
    103
    Des Moines IA
    Full Name:
    J. Hedden
    #1 the head, Aug 21, 2008
    I have a skitzy cat temp sensor on the 1-6 bank of my 89 TR I have unhooked the sensor ECU (up on pass rear shock tower) but occasionally when I hit bumps it starts buzzing and the light comes on...which is irritating, does anyone know what circuit or relay controls this in the front fuse box so I can disconnect it?

    I run test pipes so I dont need to worry about the cats overheating anyway.
     
  2. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,931
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    #2 Steve Magnusson, Aug 21, 2008
    Questions:

    1. Did you unplug both the 2-pin thermocouple connector and the 4-pin power/ground/light connector?

    2. Did you tape/insulate the 4-pin connector on the harness side so that none of its pins could accidentally touch to ground?

    Unfortunately, the fuse that runs the over-temp warning lights also runs other instruments so you can't remove that fuse to disable just the over-temp warning lights. You can unplug the buzzer -- item 14 in this SPC illustration:

    http://www.eurospares.co.uk/partTable.asp?M=1&Mo=624&A=2&B=35199&S=

    but you'll lose the buzzer warning function for low oil pressure too (although I'd guess a lot of TRs have had this buzzer disconnected anyway -- mine did/does).

    If you've unplugged and insulated the 4-pin wiring harness connector, it would be a very unusual failure IMO to cause the warning light to come on, but please give your situation.
     
  3. the head

    the head Karting

    Mar 6, 2008
    103
    Des Moines IA
    Full Name:
    J. Hedden
    #3 the head, Aug 22, 2008
    Last edited: Aug 22, 2008
    I have unplugged and insulated the thermocouple and I am taking it the four pin you are discussing is the one plugged into the module above the shock tower on the passenger side of the car yes? If so I did not insulate that disconnection so I will go in there and tape it off and see if that helps.

    If I were going to disconnect the buzzer I take it that it is behind the fuse panel?
     
  4. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,931
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    #4 Steve Magnusson, Aug 22, 2008
    Yes, inboard of the RH rear suspension (but there are two modules -- one for each bank -- so you are unplugging the thermocouple and the 4-pin connectors for both modules right?)

    Yes.
     

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